/*
 * jPOS Project [http://jpos.org]
 * Copyright (C) 2000-2015 Alejandro P. Revilla
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.jpos.iso;

/**
 * ISOFieldPackager Binary Amount
 *
 * @author apr@cs.com.uy
 * @version $Id$
 * @see ISOComponent
 */
public class IFB_AMOUNT extends ISOFieldPackager {
	private BCDInterpreter interpreter;

	public IFB_AMOUNT() {
		super();
		interpreter = BCDInterpreter.LEFT_PADDED;
	}

	/**
	 * @param len         - field len
	 * @param description symbolic descrption
	 */
	public IFB_AMOUNT(int len, String description, boolean pad) {
		super(len, description);
		this.pad = pad;
		interpreter = pad ? BCDInterpreter.LEFT_PADDED : BCDInterpreter.RIGHT_PADDED;
	}

	public void setPad(boolean pad) {
		this.pad = pad;
		interpreter = pad ? BCDInterpreter.LEFT_PADDED : BCDInterpreter.RIGHT_PADDED;
	}

	/**
	 * @param c - a component
	 * @return packed component
	 * @throws ISOException
	 */
	public byte[] pack(ISOComponent c) throws ISOException {
		String s = (String) c.getValue();
		String amount = ISOUtil.zeropad(s.substring(1), getLength() - 1);
		byte[] b = new byte[1 + (getLength() >> 1)];
		b[0] = (byte) s.charAt(0);
		interpreter.interpret(amount, b, 1);
		return b;
	}

	/**
	 * @param c      - the Component to unpack
	 * @param b      - binary image
	 * @param offset - starting offset within the binary image
	 * @return consumed bytes
	 * @throws ISOException
	 */
	public int unpack(ISOComponent c, byte[] b, int offset)
			throws ISOException {
		String d = new String(b, offset, 1)
				+ interpreter.uninterpret(b, offset + 1, getLength() - 1);
		c.setValue(d);
		return 1 + (getLength() >> 1);
	}

	public int getMaxPackedLength() {
		return 1 + (getLength() >> 1);
	}
}
